CVE-2026-31602 (GCVE-0-2026-31602)
Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-08-05 12:23
VLAI
EPSS
VEX
Title
ALSA: ctxfi: Limit PTP to a single page
Summary
In the Linux kernel, the following vulnerability has been resolved:
ALSA: ctxfi: Limit PTP to a single page
Commit 391e69143d0a increased CT_PTP_NUM from 1 to 4 to support 256
playback streams, but the additional pages are not used by the card
correctly. The CT20K2 hardware already has multiple VMEM_PTPAL
registers, but using them separately would require refactoring the
entire virtual memory allocation logic.
ct_vm_map() always uses PTEs in vm->ptp[0].area regardless of
CT_PTP_NUM. On AMD64 systems, a single PTP covers 512 PTEs (2M). When
aggregate memory allocations exceed this limit, ct_vm_map() tries to
access beyond the allocated space and causes a page fault:
BUG: unable to handle page fault for address: ffffd4ae8a10a000
Oops: Oops: 0002 [#1] SMP PTI
RIP: 0010:ct_vm_map+0x17c/0x280 [snd_ctxfi]
Call Trace:
atc_pcm_playback_prepare+0x225/0x3b0
ct_pcm_playback_prepare+0x38/0x60
snd_pcm_do_prepare+0x2f/0x50
snd_pcm_action_single+0x36/0x90
snd_pcm_action_nonatomic+0xbf/0xd0
snd_pcm_ioctl+0x28/0x40
__x64_sys_ioctl+0x97/0xe0
do_syscall_64+0x81/0x610
entry_SYSCALL_64_after_hwframe+0x76/0x7e
Revert CT_PTP_NUM to 1. The 256 SRC_RESOURCE_NUM and playback_count
remain unchanged.
Severity
7.8 (High)
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
391e69143d0a05f960e3ab39a8c26b7b230bb8a9 , < c5908160e17cb56e1f61fbaee08adc21083f4933
(git)
Affected: 391e69143d0a05f960e3ab39a8c26b7b230bb8a9 , < de8016fb0904d68ac886e375069535996baa42ee (git) Affected: 391e69143d0a05f960e3ab39a8c26b7b230bb8a9 , < 2b4331c08c0b385598b4d8ccd71e93ab3f4b2578 (git) Affected: 391e69143d0a05f960e3ab39a8c26b7b230bb8a9 , < 452894005b4abe141b11fe01e7bfe152e6d3860f (git) Affected: 391e69143d0a05f960e3ab39a8c26b7b230bb8a9 , < 365c36e1a126c6aa1aecedd3a351bcabc66f0c29 (git) Affected: 391e69143d0a05f960e3ab39a8c26b7b230bb8a9 , < 3fd0685d7fef68c2d8a04876bcf9eaa0724ad6a5 (git) Affected: 391e69143d0a05f960e3ab39a8c26b7b230bb8a9 , < b7f5ecd13cce8c2f8fa5a84c9aab65997142577e (git) Affected: 391e69143d0a05f960e3ab39a8c26b7b230bb8a9 , < ad9011a795407093dcf507f6e5da1828987b4b47 (git) Affected: 391e69143d0a05f960e3ab39a8c26b7b230bb8a9 , < e9418da50d9e5c496c22fe392e4ad74c038a94eb (git) |
guessed | |
| Linux | Linux |
Affected:
3.2
Unaffected: 0 , < 3.2 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0.1 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: ctxfi: Limit PTP to a single page\n\nCommit 391e69143d0a increased CT_PTP_NUM from 1 to 4 to support 256\nplayback streams, but the additional pages are not used by the card\ncorrectly. The CT20K2 hardware already has multiple VMEM_PTPAL\nregisters, but using them separately would require refactoring the\nentire virtual memory allocation logic.\n\nct_vm_map() always uses PTEs in vm-\u003eptp[0].area regardless of\nCT_PTP_NUM. On AMD64 systems, a single PTP covers 512 PTEs (2M). When\naggregate memory allocations exceed this limit, ct_vm_map() tries to\naccess beyond the allocated space and causes a page fault:\n\n BUG: unable to handle page fault for address: ffffd4ae8a10a000\n Oops: Oops: 0002 [#1] SMP PTI\n RIP: 0010:ct_vm_map+0x17c/0x280 [snd_ctxfi]\n Call Trace:\n atc_pcm_playback_prepare+0x225/0x3b0\n ct_pcm_playback_prepare+0x38/0x60\n snd_pcm_do_prepare+0x2f/0x50\n snd_pcm_action_single+0x36/0x90\n snd_pcm_action_nonatomic+0xbf/0xd0\n snd_pcm_ioctl+0x28/0x40\n __x64_sys_ioctl+0x97/0xe0\n do_syscall_64+0x81/0x610\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nRevert CT_PTP_NUM to 1. The 256 SRC_RESOURCE_NUM and playback_count\nremain unchanged."
}
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"value": "AV:L - The vulnerable path is reached through local ALSA PCM device operations on a ctxfi sound card, via open and ioctl on /dev/snd/pcmC*D*p. It is not reachable from network packets or user namespaces.\nAC:L - The trigger is deterministic: open/prepare enough playback substreams with normal PCM buffer sizing until the first PTP page is exceeded. There is no race or condition outside attacker control beyond access to the affected local device.\nPR:L - The attacker needs local userspace access to the ALSA PCM device node, which is commonly granted to an unprivileged logged-in audio user. No kernel capability or real root privilege is checked on the ioctl path.\nUI:N - No victim action is required after the attacker has local device access. The attacker directly issues the PCM setup and prepare ioctls.\nS:U - The impact is within the local kernel and device driver security authority. This is not a guest-to-host escape, IOMMU bypass, or other scope-changing boundary crossing.\nC:H - The bug is an out-of-bounds kernel write past the allocated page-table page, and such memory corruption can plausibly be leveraged for high-impact information disclosure. Under the higher-severity rule, this is scored as high confidentiality impact.\nI:H - ct_vm_map writes attacker-influenced DMA address values beyond vm-\u003eptp[0].area when aggregate mappings exceed one page. This is kernel memory corruption, so integrity impact is high.\nA:H - The commit documents a reproducible kernel page fault and Oops in ct_vm_map from the PCM prepare path. A local attacker can repeatedly trigger this for high availability impact."
}
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: ctxfi: Limit PTP to a single page\n\nCommit 391e69143d0a increased CT_PTP_NUM from 1 to 4 to support 256\nplayback streams, but the additional pages are not used by the card\ncorrectly. The CT20K2 hardware already has multiple VMEM_PTPAL\nregisters, but using them separately would require refactoring the\nentire virtual memory allocation logic.\n\nct_vm_map() always uses PTEs in vm-\u003eptp[0].area regardless of\nCT_PTP_NUM. On AMD64 systems, a single PTP covers 512 PTEs (2M). When\naggregate memory allocations exceed this limit, ct_vm_map() tries to\naccess beyond the allocated space and causes a page fault:\n\n BUG: unable to handle page fault for address: ffffd4ae8a10a000\n Oops: Oops: 0002 [#1] SMP PTI\n RIP: 0010:ct_vm_map+0x17c/0x280 [snd_ctxfi]\n Call Trace:\n atc_pcm_playback_prepare+0x225/0x3b0\n ct_pcm_playback_prepare+0x38/0x60\n snd_pcm_do_prepare+0x2f/0x50\n snd_pcm_action_single+0x36/0x90\n snd_pcm_action_nonatomic+0xbf/0xd0\n snd_pcm_ioctl+0x28/0x40\n __x64_sys_ioctl+0x97/0xe0\n do_syscall_64+0x81/0x610\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nRevert CT_PTP_NUM to 1. The 256 SRC_RESOURCE_NUM and playback_count\nremain unchanged."
}
],
"id": "CVE-2026-31602",
"lastModified": "2026-06-17T10:34:04.087",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-04-24T15:16:39.263",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/2b4331c08c0b385598b4d8ccd71e93ab3f4b2578"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/365c36e1a126c6aa1aecedd3a351bcabc66f0c29"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/3fd0685d7fef68c2d8a04876bcf9eaa0724ad6a5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/452894005b4abe141b11fe01e7bfe152e6d3860f"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/ad9011a795407093dcf507f6e5da1828987b4b47"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b7f5ecd13cce8c2f8fa5a84c9aab65997142577e"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/c5908160e17cb56e1f61fbaee08adc21083f4933"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/de8016fb0904d68ac886e375069535996baa42ee"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/e9418da50d9e5c496c22fe392e4ad74c038a94eb"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-06-28T11:35:01+00:00",
"cve": "CVE-2026-31602",
"id": "CVE-2026-31602",
"initial_release_date": "2026-04-24T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ALSA: ctxfi: Limit PTP to a single page",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31602.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-01T01:31:25Z",
"cve": "CVE-2026-31602",
"id": "CVE-2026-31602",
"initial_release_date": "2026-04-25T01:38:17Z",
"product_status:known_affected": "516",
"product_status:recommended": "486",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-31602",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31602.json",
"version": "27"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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